#include
void main()
{
int year 2015, month=2;
switch(month)
{
case 2: if(year%4==0&&year%100!=0||year%400==0)
printf("day=29\n");
else printf( "day=28\n"); break;
case 6:
case 9:
case 11: printi("day=30\n"); break;
default: printf("day=31\n");
}
}
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